Tanner's Cassia is a branched shrub, growing upto 1-1.5 m high. It has a smooth reddish brown bark. It has many ascending branches and 8-10 cm long pinnate leaves. There are 8-12 pairs of leaflets, each 2-3 cm long. Bright yellow flowers appear in recemes at the end of branches. The flowers are 4-5 cm across. Upper three stamens are reduced to stamenoides. Fruit is a 7-12 cm long, flat brown pod.